Toothbrush bristle pattern



FIG. 1 is a perspective view as seen from the top, front and right side of a toothbrush bristle pattern showing our new design;

FIG. 2 is a reduced top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right side elevational view thereof where the left side view is a mirror image;

FIG. 5 is a rear elevational view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines showing the handle structure are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a toothbrush bristle pattern, as shown. 